diff --git a/src/ol/extent.exports b/src/ol/extent.exports
index 23e1785d4f..b52ee8007a 100644
--- a/src/ol/extent.exports
+++ b/src/ol/extent.exports
@@ -1,2 +1,3 @@
 @exportSymbol ol.Extent
-
+@exportProperty ol.Extent.prototype.getHeight
+@exportProperty ol.Extent.prototype.getWidth